Immobilization of hydrous iron oxides in porous alginate beads for arsenic removal from water

Abinashi Sigdel, Joowan Lim, Jeongwon Park, Hyoeun Kwak, Sojin Min, Keehong Kim, Hosung Lee, Chang Hyun Nahm, Pyungkyu Park

Research output: Contribution to journalArticle

Abstract

For removal of arsenic in the aqueous phase, hydrous iron oxides (HIOs) were immobilized in alginate beads with enhanced porosity (designated as HIO-P-alginate beads). The HIO-P-lginate beads had macropores, observed by SEM, as well as mesopores and featured a higher BET surface area than previously developed adsorbent beads. Thus, the adsorption of As(iii) and As(v) by the HIO-P-alginate beads was more rapid than that of previously reported HIO-alginate adsorbents. The kinetics of adsorption were well described by a pseudo-second-order model, indicating that chemisorption mainly governed the As(iii) and As(v) adsorption. We confirmed a chemisorption mechanism for the As(iii) and As(v) adsorption, through isotherm studies using the Dubinin-Radushkevich isotherm model. The application of an intraparticle diffusion model to the kinetic data suggested that the As(v) adsorption onto the HIO-P-alginate beads was controlled entirely by intraparticle diffusion whereas the As(iii) adsorption was governed by intraparticle diffusion only at short contact times. As(iii) adsorption was highest at neutral pH; however, As(v) adsorption was highest at low pH. Both As(iii) and As(v) adsorption did not compete with nitrate adsorption, and the As adsorption improved with increasing ionic strength. The HIO-P-alginate beads could be regenerated several times with a NaOH solution and were successfully reused for arsenic removal.

Original languageEnglish
Pages (from-to)1114-1123
Number of pages10
JournalEnvironmental Science: Water Research and Technology
Volume4
Issue number8
DOIs
Publication statusPublished - 2018 Aug 1

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alginate
Alginate
Arsenic
Iron oxides
iron oxide
immobilization
arsenic
adsorption
Adsorption
Water
water
Chemisorption
Adsorbents
Isotherms
isotherm
removal
kinetics
Kinetics
macropore
Ionic strength

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology

Cite this

Sigdel, Abinashi ; Lim, Joowan ; Park, Jeongwon ; Kwak, Hyoeun ; Min, Sojin ; Kim, Keehong ; Lee, Hosung ; Nahm, Chang Hyun ; Park, Pyungkyu. / Immobilization of hydrous iron oxides in porous alginate beads for arsenic removal from water. In: Environmental Science: Water Research and Technology. 2018 ; Vol. 4, No. 8. pp. 1114-1123.
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Immobilization of hydrous iron oxides in porous alginate beads for arsenic removal from water. / Sigdel, Abinashi; Lim, Joowan; Park, Jeongwon; Kwak, Hyoeun; Min, Sojin; Kim, Keehong; Lee, Hosung; Nahm, Chang Hyun; Park, Pyungkyu.

In: Environmental Science: Water Research and Technology, Vol. 4, No. 8, 01.08.2018, p. 1114-1123.

Research output: Contribution to journalArticle

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T1 - Immobilization of hydrous iron oxides in porous alginate beads for arsenic removal from water

AU - Sigdel, Abinashi

AU - Lim, Joowan

AU - Park, Jeongwon

AU - Kwak, Hyoeun

AU - Min, Sojin

AU - Kim, Keehong

AU - Lee, Hosung

AU - Nahm, Chang Hyun

AU - Park, Pyungkyu

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N2 - For removal of arsenic in the aqueous phase, hydrous iron oxides (HIOs) were immobilized in alginate beads with enhanced porosity (designated as HIO-P-alginate beads). The HIO-P-lginate beads had macropores, observed by SEM, as well as mesopores and featured a higher BET surface area than previously developed adsorbent beads. Thus, the adsorption of As(iii) and As(v) by the HIO-P-alginate beads was more rapid than that of previously reported HIO-alginate adsorbents. The kinetics of adsorption were well described by a pseudo-second-order model, indicating that chemisorption mainly governed the As(iii) and As(v) adsorption. We confirmed a chemisorption mechanism for the As(iii) and As(v) adsorption, through isotherm studies using the Dubinin-Radushkevich isotherm model. The application of an intraparticle diffusion model to the kinetic data suggested that the As(v) adsorption onto the HIO-P-alginate beads was controlled entirely by intraparticle diffusion whereas the As(iii) adsorption was governed by intraparticle diffusion only at short contact times. As(iii) adsorption was highest at neutral pH; however, As(v) adsorption was highest at low pH. Both As(iii) and As(v) adsorption did not compete with nitrate adsorption, and the As adsorption improved with increasing ionic strength. The HIO-P-alginate beads could be regenerated several times with a NaOH solution and were successfully reused for arsenic removal.

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